Crystal Structures of (Et4N)3M2F9 (M = V,Cr, Fe) determined by X‐Ray Single‐Crystal and Powder Diffraction: A New Structure Type for A3M2X9 Compounds

The syntheses and X‐ray structure determinations of single crystals and powders are reported for the compounds (Et₄N)₃M₂F₉ (M = V³⁺, Cr³⁺, Fe³⁺). The compounds are isostructural and represent a new structure type for A₃M₂X₉ compounds. They crystallize in the hexagonal space group P6₃/m with Z = 2. Their lattice parameters are (Et₄N)₃V₂F₉: a = 13.3017(3), c = 10.7714(2) Å; (Et₄N)₃Cr₂F₉: a = 13.2691(3), c = 10.7148(3) Å; and (Et₄N)₃Fe₂F₉: a = 13.3040(3), c = 10.7650(3) Å.